The edit area turns gray

When I switch the browser TAB, it looks like this. How do I fix it

Document Server version: 8.0.0

Hello @GGbeng1
The situation looks similar to this one: Canvas content disappears when switching tabs - #9 by hufei
That thread describes the issue that is related to Chrome version. Please make sure that you are using v.125+
Please let us know the result.